bathroom dryrot

shower pan leaked on the two front corners because it wasn't installed properly. subflooring is now completely removed. Problem is there is dry rot damage to flooring in both corners that run under the tiled bathroom flooring about an inch in front of the shower area. This floor is plywood with concrete and tile over it. I;ve removed the rotted wood underneath but don't want to remove this tiled and concrete flooring to get to these areas. Can I use wood epoxy to fill these holes? The floor is stable and is not sagging at all. The tiles are not loose and the floor is solid. The shower pan will not sit on these areas. I thought after I use epoxy I can attach additional plywood under these areas. Thanks for your help. Mary M.

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bathroom dryrot

new shower pan installed ready to tile the walls. when tiling, should the ceramic tiles rest on the shower pan or should there be a gap between the bottom of the tile and the shower pan? I know that area will be caulked eventually. Also, how large can a grout line be between tiles? One wall is just right but the one side is slightly off and would require a larger grout line or cutting larger tiles to fit toward the bottom of the shower pan.